US4912960A - Automatic precision stamping press and method for changing tools - Google Patents

Automatic precision stamping press and method for changing tools Download PDF

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Publication number
US4912960A
US4912960A US07/204,510 US20451088A US4912960A US 4912960 A US4912960 A US 4912960A US 20451088 A US20451088 A US 20451088A US 4912960 A US4912960 A US 4912960A
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US
United States
Prior art keywords
press
tool
automatic precision
plunger
precision stamping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/204,510
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English (en)
Inventor
Joseph Kroener
Thomas Hartwig
Helmut Messner
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Bruderer AG
Siemens AG
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Siemens AG
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Assigned to SIEMENS AKTIENGESELLSCHAFT, BRUDERER AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HARTWIG, THOMAS, KROENER, JOSEPH, MESSNER, HELMUT
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/14—Particular arrangements for handling and holding in place complete dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/0063—Connecting non-slidable parts of machine tools to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
    • B23Q16/001—Stops, cams, or holders therefor

Definitions

  • the invention relates to the field of automation precision stamping presses with exchangeable tools, and to an operating method for changing tools in an automatic precision stamping press.
  • stamping tools are used which essentially comprise an upper tool part and a lower tool part. Into these tool halves, the forming parts, the punch and the die, are arranged. Between the forming parts, a material to be processed as semifinished material is stressed beyond its yield point with the objective being to manufacture a given number of identical work pieces from it.
  • the manufacturing accuracy of these work pieces produced by forming and cutting depends on the shape and the dimensional accuracy of the tool. In addition to the accuracy of the stamping tool achieved in production, however, the shape and dimensional accuracy of the stamped parts are also determined by the manner in which shear forces occuring during the stamping are taken up. Relative motions of the shaped parts in the horizontal direction relative to each other should be minimized.
  • stamping tools in the past have been equipped with guides for the tool halves which hold the forming parts. By these guides, the tool halves were likewise positioned relative to each other.
  • tools with plate guidance there are at least three types: tools with plate guidance; tools with column guidance; and tools with changing frames.
  • Tools with plate guidance have a guiding plate firmly connected to the lower part of the tool which takes over the guidance of the punch and the positioning of the tool halves. In these tools, the punches must not leave the guiding plate due to the press stroke.
  • Tools with column guidance are constructed either from a column frame or from plates into which the columns are worked. In this way, the guidance and positioning of the tool halves are transferred to two or more columns.
  • the design can be further completed by a spring-loaded punch guiding plate within the tool, especially in composite sequential tools with large shear forces.
  • Tools with changing frames have their exchangeable tool halves inserted into a changing frame which takes over guidance and positioning. Accurate correlation of the tool halves and thereby the forming parts is provided only in the changing frame.
  • German Patent 27 11 696 a precision cutting tool with a movable plunger and a fixed table for punch preses for cutting-out sheet metal parts is described.
  • the active tool part (the punch and the cutting plate) are accurately guided relative to each other by at least two closed linear guides which are arranged outside the tool and are in engagement near the operating plane.
  • Each linear guide has two elements, a guiding column in a guiding sleeve, and one of these elements is connected to the plunger and the other one to the table.
  • Such a stamping tool can supplement an automatic stamping press according to German published Unexamined patent application 22 41 639.
  • an automatic stamping press comprising a press plunger, a press table and an exchangeable guideless tool having separate tool halves with an upper tool fastenable to the press table. Guiding columns and corresponding guiding sleeves accurately guide outside the tool halves the press plunger and the press table.
  • Positioning devices engage the mounting plates, with at least one positioning device for each mounting plate operating to respectively position the upper tool part at the press plunger, and the lower tool part at the press table.
  • the positioning devices are hydraulic clamping plugs that are arranged on a diagonal of each of the mounting plates. Also provided is a method for operating the automatic precision stamping press.
  • the accuracy of plunger guidance of the automatic precision stamping press is now utilized for the first time.
  • the guidance of the stamping tools can be replaced by the guidance of the press plunger consisting of guiding columns and guiding sleeves as compared to the press table, which is already known per se but has not found acceptance in practice because of the time-consuming positioning.
  • an automatic stamping press having a positioning and clamping system which permits clamping of the two tool halves of the guideless tools so exactly that the guiding behavior of the plunger is fully transferred to the tools.
  • FIG. 1 is a cross section of part of an automatic stamping press with a press plunger, press table and tool;
  • FIG. 2 is an enlarged view of the positioning apparatus used in FIG. 1;
  • FIG. 3 is a top view of a mounting plate used in FIG. 1;
  • FIG. 3A shows a positioning plug having an oval cross section
  • FIG. 3B shows a positioning plug having a round cross section
  • FIGS. 4 and 5 illustrate different embodiments of positioning pin supports for the positioning pins of FIG. 3;
  • FIGS. 6a and 6b show a tensioning element in the tensioned and released conditions
  • FIG. 7 is a view corresponding to FIG. 1 without a tool, but with a corresponding adjustment gauge.
  • a press plunger 1 and a corresponding press table 2 of an automatic precision stamping press are accurately guided via guiding columns 3, which engage guiding sleeves 4.
  • a tool comprising an upper tool part 10 and a lower tool part 20 is arranged.
  • the upper tool part 10 is connected by a mounting plate 30 to the plunger 1.
  • the lower tool part 20 is connected to an intermediate part 6, that is itself connected to the mounting plate 40.
  • a cutting plunger 11 which engages a suitably designed cutting die 21 of the lower tool part 20 is integrated into the upper tool part 10.
  • a continuous strip 50 is shown which serves as the semifinished material for the work pieces to be manufactured.
  • a guideless tool of the type described having a press table and press plungers which are guided by sliding guides is known from German patent 27 11 696.
  • the upper tool part 10 is connected to the press plunger 1 by positioning devices 100 and similarly, the lower tool part 20 is connected to the press table 2 by positioning devices 200.
  • two mutually offset positioning devices 100 and 100', 200 and 200' are provided, of which only one is visible in the cross-sectional view.
  • the positioning devices 100 and 200 of the two halves are arranged with mirror symmetry to each other.
  • a positioning device 100 comprises a base body 101 with a hole 102 for adjustment and contains a hydraulic clamping plug 110.
  • Such hydraulic clamping plugs are known in machine tool technology. These hydraulic clamping plugs are used since the cross section of these pins or plugs can be varied by the supply of pressure medium in order to ensure detachable clamping.
  • Different pressure medium lines 106, 107 and 108 for supplying the pressure medium are indicated in FIG. 2 in the base body 101.
  • the base body 101 is sealed with a lid 109 by screws 105.
  • the mounting plate 30 which is basically rectangular in top view comprises two holes 31 and 32 offset diagonally for engagement of the adjustment plug 110 shown in FIG. 2. Furthermore, four holes 33 to 36 are provided, asymmetrically distributed, for clamping elements 60 explained in detail later in FIGS. 6a and 6b.
  • the mounting plate 30 has on the front side a trapezoidal extension 45 in which two further holes 37 and 38 are made. These holes serve for the engagement of a handling device for changing tools, which will not be discussed in detail here.
  • FIG. 7 shows an adjustment gauge 300 inserted instead of a tool in an automatic precision stamping press according to FIG. 1.
  • the adjustment gauge 300 comprises a metallic block which has the functional dimensions of a stamping tool that is engaged, and has two through holes 310 and 320.
  • FIG. 1 in conjunction with FIG. 3, that for each tool half 10 and 20, respectively, two positioning devices 100, and 100' and 200, 200' are used. These positioning devices are arranged in the diagonals of the tool mounting plates 30 and 40. All of the positioning devices 100, 100' and 200, 200' are built with their base unit into the press plunger 1 or the press table 2, and serve for the positioning of the upper tool part 10 on the table 2.
  • the functional parts of the positioning devices 100, 100' and 200, 200' are the positioning plugs 110 and 110' and 210, 210' which include pistons in hydraulic cylinders.
  • the positioning plugs 110, 110' are first arranged flush with the clamping surfaces at the plunger 1 of the press and are then inserted from above into the upper mounting plate 30.
  • the positioning plugs 210, 210' are also arranged flush with the clamping surfaces at the table 2 of the press and then inserted from below into the lower mounting plate 40.
  • the positioning of the tool takes place by increasing the circumference of that part of the plug 110, 110' and 210, 210' which is immersed in the mounting plates 30 and 40 in the region of the clamping surfaces.
  • the position of the guiding sleeve of the positioning plugs 110, 110', 210 and 210' in the clamping surface is transferred exactly to the sleeve in the mounting plate 30 or 40 to be positioned.
  • the mounting plate 30 or 40 with the upper or lower tool part is positioned on two positioning points by plugs 110 and 110' or plugs 210 and 210'.
  • positioning it is important that always only one plug 110 or 210 with a round cross section and therefore a round circumference is positioned at its entire circumference in the clamping surface of the plunger 1 or the table 2 of the press and in the mounting plates 30 and 40, while the other plug 110' and 210' is positioned only in the clamping surfaces of the plunger 1 or the table 2 of the press.
  • an extension of the centering diameter of the two plugs 110' and 210' which position only in the clamping surfaces of the plunger 1 or the table 2 is made with an oval cross section and cannot be expanded.
  • the longest diameter of the oval cross section corresponds to the round cross section of the sleeve.
  • the shortest diameter of the oval cross section lies in the diagonal of the mounting plate 30.
  • the contact line between the oval cross section of the plug 110' and the round cross section of the sleeve 31 should cross only a vertical alignment towards the diagonal of the mounting plate 30, which are defined through the two positioning points. Thereby, unevenly tempered tool and machine plates can be positioned without the production of a forced stress by the thermal expansion due to a temperature equalization. Thereby a linear mobility of the mounting plates 30 and 40 in the direction of their diagonals is ensured, because of the oval cross section and the round cross section.
  • the radii of the oval part of the positioning plugs 110' and 210' as well as the holes 31 to be positioned in the mounting plate 30 and 40 are matched to each other. This matching is done in such a manner that thermal expansion in the direction of the diagonal divided into length changes in the running direction of the strip and perpendicularly to the running direction of the strip, does not exceed about 10% of the customary cutting gap dimensions including the necessary play between the two elements in engagement with each other.
  • a slide element 70 is shown, which lies in the direction of the diagonal of the mounting plate 30 or 40.
  • the slide element 70 allows therefore a mobility in this direction by small forces.
  • the sliding element 70 can be realized as a dove tail guide 71 and the mounting plate 30, with the dove-tail guide 71 with its close sliding fit extending in the diagonal direction.
  • a roller bearing 710 is mounted on the plunger 1 or the table 2 of the press.
  • the roller bearing 710 carries a lever 700 which in turn can take up one of the two clamping posts 110, 210.
  • the roller bearing 710 is arranged at a distance from the diagonal, so that tilting lever 700 permits a substantial linear motion of the clamping plug 110, 210 along the diagonal of the mounting plate 30 or 40.
  • FIGS. 4 and 5 The positioning achieved by the two embodiments in FIGS. 4 and 5 occurs under the same play conditions as in FIG. 3 via an area contact. In these alternate embodiments, wear phenomena such as might occur with oval clamping plugs are avoided. (In the case of the clamping post 110' and 210', line contact takes place because of the oval shape, whereby the surface of the oval region is subjected to increased wear.)
  • tensioning elements 60 which are used for holding the mounting plates 30 and 40 are shown in both their clamped and detached positions.
  • the tensioning element 60 is a T-shaped latch (as seen in cross-section).
  • the T-shaped latch is inserted into the holes 33-36, and the mounting plates 30 and 40 are locked by a 90 rotation of the respective latches.
  • the upper part 61 of the tensioning element 60 comprises hydraulic tensioning and rotation cylinders which will not be discussed in detail since tensioning elements per se are known to those of ordinary skill in the art.
  • the mounting plates 30 and 40 of the two tool halves 10 and 20 are largely of identical design, as seen in FIGS. 3-5.
  • the mounting plates 30 and 40 in the illustrated exemplary embodiments additionally have semicircular recesses 39, arranged laterally, for securing the two tool halves 10 and 20 in receiving stations.
  • a tool changer engages the trapezoidal extension 45 with the two holes 37 and 38 serving as the handling device.
  • the tensioning and clamping elements 60 shown in FIGS. 6a and 6b are commercially available hydraulic rotary tensioners. However, it is important that the hydraulic clamping pressure of the individual asymmetrically offset tensioning elements 60 can be set separately. This is to allow the high clamping pressure at the tensioning element in the vicinity of that positioning plug which positions the clamping surface and the mounting plate, to fix the mounting plate 30 relative to the clamping plate. It also permits thermal expansion in the direction of the diagonal without stress by low clamping pressure in the vicinity of that positioning plug which positions only perpendicularly to the diagonal.
  • the clamping screws of the cylinders and/or of the guiding sleeves of the positioning devices 100, 100' and 200, 200' in the clamping surfaces are loosened and the adjustment gauge 300 is aligned in the press setting room with ground stop strips in the press table 2.
  • the positioning plugs 110, 110' and 210, 210' of the positioning devices 100, 100' and 200, 200' are then inserted from both sides into the through holes 310 and 320 of the gauge 300 and are expanded.
  • the clamping screws of the cylinders and/or of the guiding sleeves are tightened and the positioning devices are thereby fixed. Therefore, the dimensions of the distance of the positioning devices, copied exactly by the adjustment gauge 300, can be transferred to the tools clamped subsequently.
  • the tool halves 10 and 20 of the guideless tools can be guided via the plunger guide of the press without further adjustment, with exact positioning and reproducible at any time, and clamped there. Thereby, an extremely fast tool change allowing flexible production is possible so that the machine shutdown times are minimized.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Press Drives And Press Lines (AREA)
  • Drilling And Boring (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US07/204,510 1987-06-10 1988-06-09 Automatic precision stamping press and method for changing tools Expired - Fee Related US4912960A (en)

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Application Number Priority Date Filing Date Title
DE3719370 1987-06-10
DE3719370 1987-06-10

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US (1) US4912960A (ja)
EP (1) EP0294765B1 (ja)
JP (1) JPS63317223A (ja)
DE (1) DE3869665D1 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5113686A (en) * 1990-12-14 1992-05-19 Mazda Motor Mfg. (Usa) Corp. Zero-Tolerance die location pin
CN100382913C (zh) * 2005-07-30 2008-04-23 张世德 一种安全压力模具
CN102806276A (zh) * 2012-08-24 2012-12-05 昆山旭虹精密零组件有限公司 冲压模具脱料板入块及冲子在模具内的快拆结构
US20160184878A1 (en) * 2013-06-26 2016-06-30 Kia Motors Corporation Method of manufacturing press mold for mass-producing hot stamping cold trim and press mold for mass-producing hot stamping cold trim manufactured using the same
CN107570587A (zh) * 2017-10-27 2018-01-12 天津市鑫源泓达科技有限公司 一种冲压件形状可调的新型冲压模具
US20220024245A1 (en) * 2019-04-12 2022-01-27 Schuler Pressen Gmbh Tool unit, press for holding such a tool unit and method for a ready-to-operate arrangement of the tool unit in the holder of the press

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008119704A (ja) * 2006-11-09 2008-05-29 F C C:Kk プレス加工装置
CN102139314B (zh) * 2010-11-20 2013-03-06 无锡曙光模具有限公司 加工新型轿车座椅拖把的打扁成型冲孔模具
CN103480745A (zh) * 2013-09-30 2014-01-01 大连益联金属成型有限公司 一种接线盒侧表面翻孔模具
DE102014007732B4 (de) * 2014-05-28 2017-10-05 Fritz Stepper Gmbh & Co. Kg Bearbeitungseinheit für eine Presse und Zentrieradapter für eine Bearbeitungseinheit sowie Verfahren zur Ausrichtung eines Gestelloberteils und eines Gestellunterteils einer Bearbeitungseinheit einer Presse und eine Bearbeitungseinheit verwendende Presse
CN104308005A (zh) * 2014-10-31 2015-01-28 苏州广型模具有限公司 一种模具支座

Citations (11)

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Publication number Priority date Publication date Assignee Title
US3229791A (en) * 1962-07-11 1966-01-18 Federal Warco Division Apparatus for use with presses and the like
US3638473A (en) * 1969-11-19 1972-02-01 Wyman Gordon Co Block and die shoe clamping assembly
US3881343A (en) * 1974-07-22 1975-05-06 John S Ducate Die set clamping mechanism
JPS5835026A (ja) * 1981-08-25 1983-03-01 Naganoken プレス金型の型あわせ方法およびその装置
JPS59127936A (ja) * 1983-01-10 1984-07-23 Atoda Kinzoku Kk 金型の位置決め装置
JPS59127935A (ja) * 1983-01-10 1984-07-23 Atoda Kinzoku Kk 金型位置決め装置
JPS59127937A (ja) * 1983-01-10 1984-07-23 Atoda Kinzoku Kk 金型の位置決め装置
US4473346A (en) * 1981-12-11 1984-09-25 Karl Hehl Mechanism for the attachment of interchangeable molds in an injection molding machine
US4520919A (en) * 1981-07-21 1985-06-04 Aioi Seiki Kabushiki Kaisha Work-clamp pallet for machine tool
SU1189545A1 (ru) * 1983-11-30 1985-11-07 Vladimir A Domrachev Узел крепления штампа к ползуну пресса
US4790174A (en) * 1986-05-30 1988-12-13 Firma Maschinenfabrik Hilma Gmbh Adjusting drive for insert tighteners of presses

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
US3126776A (en) * 1964-03-31 Lawrence v whistler sr
DE952254C (de) * 1945-02-14 1956-11-15 Ernst Haase Saeulenfuehrungsgestell fuer auswechselbare Einbauwerkzeuge
US3918694A (en) * 1974-05-06 1975-11-11 Richard D Laudick Locator pin
US4011781A (en) * 1976-01-09 1977-03-15 Whistler Jr Lawrence V Cutoff die
DE7936269U1 (de) * 1979-12-22 1983-07-07 Ernst Mohrbach Kg, 6661 Rieschweiler Vorrichtung an balkenstanzmaschinen zum auflegen und ausrichten von stanzmessern
US4476762A (en) * 1982-01-18 1984-10-16 Anderson Iii Frank T Cutting die supporting plate apparatus

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229791A (en) * 1962-07-11 1966-01-18 Federal Warco Division Apparatus for use with presses and the like
US3638473A (en) * 1969-11-19 1972-02-01 Wyman Gordon Co Block and die shoe clamping assembly
US3881343A (en) * 1974-07-22 1975-05-06 John S Ducate Die set clamping mechanism
US4520919A (en) * 1981-07-21 1985-06-04 Aioi Seiki Kabushiki Kaisha Work-clamp pallet for machine tool
JPS5835026A (ja) * 1981-08-25 1983-03-01 Naganoken プレス金型の型あわせ方法およびその装置
US4473346A (en) * 1981-12-11 1984-09-25 Karl Hehl Mechanism for the attachment of interchangeable molds in an injection molding machine
JPS59127936A (ja) * 1983-01-10 1984-07-23 Atoda Kinzoku Kk 金型の位置決め装置
JPS59127935A (ja) * 1983-01-10 1984-07-23 Atoda Kinzoku Kk 金型位置決め装置
JPS59127937A (ja) * 1983-01-10 1984-07-23 Atoda Kinzoku Kk 金型の位置決め装置
SU1189545A1 (ru) * 1983-11-30 1985-11-07 Vladimir A Domrachev Узел крепления штампа к ползуну пресса
US4790174A (en) * 1986-05-30 1988-12-13 Firma Maschinenfabrik Hilma Gmbh Adjusting drive for insert tighteners of presses

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5113686A (en) * 1990-12-14 1992-05-19 Mazda Motor Mfg. (Usa) Corp. Zero-Tolerance die location pin
CN100382913C (zh) * 2005-07-30 2008-04-23 张世德 一种安全压力模具
CN102806276A (zh) * 2012-08-24 2012-12-05 昆山旭虹精密零组件有限公司 冲压模具脱料板入块及冲子在模具内的快拆结构
US20160184878A1 (en) * 2013-06-26 2016-06-30 Kia Motors Corporation Method of manufacturing press mold for mass-producing hot stamping cold trim and press mold for mass-producing hot stamping cold trim manufactured using the same
CN107570587A (zh) * 2017-10-27 2018-01-12 天津市鑫源泓达科技有限公司 一种冲压件形状可调的新型冲压模具
US20220024245A1 (en) * 2019-04-12 2022-01-27 Schuler Pressen Gmbh Tool unit, press for holding such a tool unit and method for a ready-to-operate arrangement of the tool unit in the holder of the press

Also Published As

Publication number Publication date
JPS63317223A (ja) 1988-12-26
EP0294765A1 (de) 1988-12-14
DE3869665D1 (de) 1992-05-07
EP0294765B1 (de) 1992-04-01

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